Poppet type metering valves are widely used in hydraulic systems due to their many advantages, such as low leakage, large flow capacities, and economical design. However, they can also induce unpredictable vibration and noise in hydraulic systems. In this paper, the stability and performance of Valvistor valves that use the flow amplification principle are studied. A stability criterion was derived from a mathematical model and showed that the stability of the valve was related to the opening of the pilot valve. The hydraulic system model of the valve was established using the simulation software SmiluationX. The valve was measured in order to validate the mathematical model and valve model. Theoretical analysis and simulation results showed that increasing the pressure drop and the width of the slot will increase the response speed of the spool but reduce the stability of the valve, and reducing control chamber volume will increase the stability of the valve. The results provide a theoretical basis for performance improvement of the valve.